Bafang error 07: Over voltage protection
Bafang BBS01/BBS02/BBSHD, M-series mid-drives and hub motors (UART & CAN displays)WarningRide with caution
The controller measured a battery voltage above its allowed maximum and shut down. Riders often see this right after a full charge, on long descents with regenerative-capable systems, or after fitting a higher-voltage battery. The motor stays off until the voltage falls back inside the window.
| Drive system | Bafang BBS01/BBS02/BBSHD, M-series mid-drives and hub motors (UART & CAN displays) |
| Severity | Warning |
| Keep riding? | Ride with caution |
| Typical cost | A mismatched charger is EUR/USD 30-80; a controller replacement EUR/USD 80-250. |
Likely causes
- Battery voltage is too high for the controller (52V pack on a 48V-only controller, 48V on a 36V)
- Freshly charged pack sitting slightly above the controller's upper limit
- Faulty charger overcharging the pack
- Controller voltage sensing circuit drifting or damaged
- Regenerative braking pushing voltage up on a full battery (CAN hub systems)
How to fix Bafang error 07
- Confirm the battery nominal voltage matches the controller and display settings
- Ride a short distance on low assist (or let the pack rest) to bring voltage down, then power cycle
- Measure the battery at the terminals: 54.6V max for 48V, 58.8V for 52V, 42V for 36V
- Check the charger's output voltage with a multimeter; replace it if it exceeds the pack rating
- If the voltage is correct and the code persists, the controller's sense circuit is faulty: shop
Go to a dealer if: Go to a shop if the voltage checks out on a multimeter but the code stays, or if you are unsure which battery/controller combination you have.
Warranty: If the bike or kit is under warranty (usually 1-2 years via the seller), contact them before opening anything, as opened motors and controllers can void the claim.
Typical cost: A mismatched charger is EUR/USD 30-80; a controller replacement EUR/USD 80-250.
Warranty: If the bike or kit is under warranty (usually 1-2 years via the seller), contact them before opening anything, as opened motors and controllers can void the claim.
Typical cost: A mismatched charger is EUR/USD 30-80; a controller replacement EUR/USD 80-250.
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.
Frequently asked
Can I reset error 07?
It clears when the voltage drops below the limit; power cycle after a few minutes of riding on low assist.
Can I keep riding with error 07?
Once it clears yes, but do not ignore a repeated 07: continuous over-voltage can kill the controller.
Warranty?
A controller that misreads voltage is a warranty case; using the wrong battery voltage is not.
Related Bafang codes
Manuals and video
Not an official Bafang document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.